1988 ford bronco back window motor does not work

Your key switch could be bad, leave the gate up and then check to see if power is coming out of the switch. if not you can by pass the switch entirely, or replace. the motor is only three 1/4 inch bolts attached to the tailgate. to check that you can get two lengths of wire and plug into the wire chassis going into the motor and then use a car battery to roll the window down or up by switching the polarity. just becareful not to hurt yourself.

Remove the access panel on the tailgate and test to see if there is power to the motor. if there isn't check the fuse, wire and the safety switch either located on the bottom of the handle or the drivers side latch. if there is power to the motor replace the motor, it is the same as the passanger door window motor